Aerosol shaving lather containing an oxazoline homopolymer

ABSTRACT

Aerosol shaving lather incorporating therein a small amount of a water-soluble homopolymer of 4,4-bis(hydroxymethyl)-2-alkenyl-2oxazoline is disclosed.

, 1ates atent AEROSOL SHAVING LATHER CONTAINING AN OXAZOLINE HOMOPOLYMERInventors: Roy A. White, Somers, Conn;

Rudolph D. Deanin, Westford, Mass.

Assignee: Commercial Solvents Corporation,

Terre Haute, Ind.

Filed: Apr. 26, 1972 Appl. N0.: 247,544

US. Cl 252/90, 252/DIG. 2, 252/117, 252/132, 252/307, 252/351, 424/47,424/73,

Int. .Cl Cl ld 17/00 8]" Field of Search 424/47 73; 260/307 F,

260/883 R; 252/117, 132, 351, 90, DIG. 2, 307, 309

References Cited UNITED STATES PATENTS H1961 Reed ..424/73x FOREIGNPATENTS OR APPLICATIONS 719,647 12/1954 Great Britain ..424/73 675,66412/1963 Canada "424/73 Primary Examiner-Albert T. Meyers AssistantExaminerVera C. Clarke Attorney, Agent, or Firml-Iow ard E. Post; RobertH. Dewey [57] ABSTRACT Aerosol shaving lather incorporating therein asmall amount of a water-soluble homopolymer of 4,4-bis(hydroxymethyl)-2-alkenyl-2-oxazoline is disclosed.

5 Claims, N0 Drawings AEROSOL SHAVING LATI-IER CONTAINING AN OXAZOLINEHOMOPOLYMER BACKGROUND OF THE INVENTION This invention relates to animproved shaving lather. In a particular aspect this invention relatesto aerosoldispensed shaving lather having improved foam stability.

Aerosol shaving creams consist essentially of a soap solution releasedfrom a pressurized can in a foamy state for spreading on the shaversface with fingers or brush.

The soap is generally a combination of triethanolamine, stearic acid andstripped coconut fatty acid, at a concentration of about 7 percent to 12percent, with a free fatty acid range of about 1 percent to 3 percent.The ratio of stearic acid to coconut oil fatty'acid ranges from 70/30 to90/10.

Either a fluorinated hydrocarbon or a liquefied petroleum hydrocarbon isused as the propellant. Fluorinated hydrocarbons are usually a blend ofdichlorodifluoromethane (Propellant 12) with dichlorofluoroethane(Propellant 1 14) in a weight ratio of 40/60 or 57/43. They are used ata level of about 6 percent to 10 percent in the formulation. Liquefiedpetroleum hydrocarbons are usually mol blends of about 87 percentisobutane and 13% propane that are used at a level of 3 percent to 7percent.

A humectant, to hold moisture on the face and prevent drying out of thelather during the shave, is particularly important in aerosol creams.Also important are foam stabilizers which tend to prevent collapse ofthe foam during the shaving period.

Products of this type are well known. They are disclosed, e.g. in U.S.Pat. No. 2,655,480 issued to Spitzer et al.

SUMMARY OF THE INVENTION where R is hydrogen, methyl or ethyl whenincorporated in aerosol-dispersed shaving lathers improves the foamstability and provides a-lather having smaller gas bubbles whereby acreamier, smoother shaving lather is obtained.

DETAILED DISCUSSION The homopolymers useful in the practice of thepresent invention are known in the art. The monomer can US. Pat. No.3,248,397 which is incorporated herein by reference thereto. The monomerpolymerizes readily by standing at room temperature, by heating, or byheating in the presence of a polymerization catalyst, many of which areknown.

The amount of polymer used is within from about 0.1 to about 1.0 percentof the soap solution, preferably about 0.2 to about 0.5 percent.Conveniently the polymer is employed as an aqueous solution. The termwater-soluble as used herein is not intended to limit the invention tothe fonnation of true solutions. It is also intended to includehomopolymers which form colloidol solutions and dispersions.

The shaving lathers used in the practice of this invention are thosebased principally on fatty acid soaps, e. g. alkanolamine, sodium, orpotassium soaps of lauric, myristic, palmitic', oleic or stearic acids.Other foaming agents can also be present, e.g. salts of alkyl arylsulfonates or salts of sulfated alcohol, e.g. sodium lauryl sulfate. lThe invention will be better understood with reference to the followingexamples. It is understood, however, that the examples are intended forillustration only and it is not intended that the invention be limitedthereby.

EXAMPLE I 4,4-Bis(hydroxymethyl)-2-isopropenyl-2-oxazoline, 100 g, wasdissolved in 400g of tetrahydrofuran in the presence of 0.7 g oftert.-butyl peroxy pivalate and 2 g of triethanolamine. The mixture wasagitated for twenty hours at 60C during which time high molecular weightpolymer precipitated from solution. It was filtered, washed byextraction with a solution of parts methanol and 20 partstetrahydrofuran. The polymer was dried at reduced pressure. It had asoftening point at l00-l 40C and was water-soluble. The dry polymer washygroscopic. It absorbed 7 9 percent by wt of water at 50 percentrelative humidity; 2 l-24 percent at 76 percent humidity; and 40-47percent at percent humidity.

A shaving soap 'was prepared from the following ingredients:

Stearic Acid Lauric Acid Cetyl Alcohol Petroleum Jelly SorbitolTriethanolamine Potassium Hydroxide Water The triethanolamine andpotassium hydroxide were dissolved in part of the water. The mixture washeated to 70C and the other ingredients were added with stirring. Themixture was heated until all ingredients had melted and blended and wasthen cooled and diluted with stirring until all of the water was added.The ste aric acid, lauric acid, triethanolamine and potassium hydroxideconstitute the soap portion of the above formula. Their combined weightis about 12.38 g of a total of about 90 g, thus constituting about 13.75percent of the total solution.

An aerosol was prepared from the above soap solution according to thefollowing formula:

Soap Solution 90 g Water containing 0.24 g polymer l Freon l2(dichlorodifluoromethane) 6 Freon l 14 (dichlorofluoromethane) 4 Themixture was charged into cans fitted with 20 mm valves, 0.070 stems, and0.080 bodies. The mixture dispensed foam satisfactorily, the 4,4-bis(hydroxymethyl)-2-isopropenyl-2-oxazoline homopolymer gave a somewhatfiner foam, and a noticeably cooler, slightly closer shave with a safetyrazor.

The foregoing experiment was repeated in all essential details exceptthat polyvinylpyrolidone (PVP) was substituted for the oxazolinepolymer. PVP is commonly used as a foam stabilizer. The aerosolformulated with the oxazoline polymer produced a finer foam and anoticeably cooler, slightly closer shave with a safety razor than didthe aerosol formulated with PVP.

EXAMPLE 2 Using the homopolymer of Example 1, an aerosol lather isprepared according to the following formula:

The above ingredients are heated to 80C and there is slowly added withagitation:

Triethunolamine 3.5 Oxazoline homopolymer .2 Water 78.5

Arluccl 60 is the trademark of Atlas Powder Co. for sorbitanmonostearate. Tween 60 is Atlas trademark for polyoxyethylenc 20sorbitan monostcarate.

The mixtureis cooled slowly to room temperature with EXAMPLE 3 Theexperiment of Example 2 is repeated in all essential details except thefollowing formula is used:

Stearic Acid 6.0% Myristic Acid 20 Lanolin 0.8 Cetyl Alcohol 0.5 Tween20 (polyoxy- 5.0

ethylene 20 sorbitan monolaurate) Tween (polyoxy- 5.0%

ethylene 20 sorbitan monooleate) Triethanolamine 4.0 Borax 0.1

The above ingredients are heated to 80C and there is added thereto withstorage the following mixture preheated to 82:

Neutral sodium 1.0%

stearate Sorbitol 3.5

Oxazoline homopolymer 1.0

Water 71 l The stearic acid, myristic acidjtriethanolamine and neutralsodium stearate constitute the soap portion of the above formula. Theircombined proportions constitute about 13 percent of the total solution.

The mixture is packaged as before. It produces a rich, moist lather ofexcellent stability.

bis(hydroxymethyl)-2-isopropenyl 2-oxazoline. A moist, stable foam isobtained.

EXAMPLE 5 The experiment of Example 1 is repeated in all essentialdetails except that 4,4-bis(hydroxymethyl)-2- isobutenyl)-2-oxazoline issubstituted by 4,4- bis(hydroxy-methyl)-2 isopropenyl-2-oxazoline. Amoist, stable foam is obtained.

We claim:

1. An aerosol-dispensedshaving lather consisting es sentially of anaqueous solution of from about 1 l.5-l3.75 percent soap and from about0.1 to about 1.0 percent of the homopolymer of an oxazolinecorresponding to the formula where R is hydrogen, methyl or ethyl and aneffective amount of a propellant.

2. The composition of claim 1 wherein said Oxazoline is4,4-bis(hydroxymethyl)-2-oxazo1ine.

3. The composition of claim 1 wherein said oxazoline is4,4-bis(hydroxymethyl)-2-isopropenyl-2-oxazoline.

4. The composition of claim 1 wherein said Oxazoline is4,4-bis(hydroxymethyl)-2-isobutenyl-2-oxazoline.

5. The composition of claim I wherein said homopolymer is employed at aconcentration within 0.2 to 0.5

2 2 3 2 UNITED STATES PATENT io FIcE CERTIFICATE OF CORRECTION PatentNo. 3 g21 1 15 Dated June 28, 1974 Inventor(s) a m j It is certifiedthat error appears in the above-identified patent and that said LettersPatent are hereby corrected as shown below:

I" v 1 '"v Column 1, line 61,. "dispersed" should be dispensed- Column3, line 31, "ester" should be -ester) Column 4, line 37, following theword "lather" insert --composition-- Column 4, line 53,"4,4-bis(hydroxymethyl) 2oxazoline" should be--4,4-bis(hydroxymethyl-Zethenyl-2oxazoline- Signed andsealed this 5thday of November 1974.

(SEAL) Attest:

McCOY M. GIBSON JR. C. MARSHALL DANN Attesting Officer Commissioner ofPatents Po-wfid "UNITED STATES PATENT oFFlcE t f .CERTIFICATE OFCORRECTION Patent No. 3: gg g Dated June 28. 1974 Inventor-(5)3 A WhitIt is certified that error appears in the above-identified patent andthat said Letters Patent are hereby corrected as shown below:

Column 1, line 61, "dispersed" should be -dispensed- Column 3, line 31,"ester" should be ester)-- Column 4, line 37, following the word"lather" insert --composition- Colunm 4, line 53,"4,4-bis(hydroxymethyl)-2oxazoline" should be--4,4-bis(hydroxymethyl2-ethenyl-2-oxazoline-- Signed and sealed this5th day of November 1974.

(SEAL) Attest:

McCOY M. GIBSON JR. C. MARSHALL DANN Attesting Officer Commissioner ofPatents

2. The composition of claim 1 wherein said oxazoline is4,4-bis(hydroxymethyl)-2-oxazoline.
 3. The composition of claim 1wherein said oxazoline is4,4-bis(hydroxymethyl)-2-isopropenyl-2-oxazoline.
 4. The composition ofclaim 1 wherein said oxazoline is4,4-bis(hydroxymethyl)-2-isobutenyl-2-oxazoline.
 5. The composition ofclaim 1 wherein said homopolymer is employed at a concentration within0.2 to 0.5 percent.